Page 301 - 2018_IRC

WALL CONSTRUCTION

R607.5.2.1 Panel anchor restraints. Panel anchors R608.1.1 Interior construction. These provisions are
shall be spaced not greater than 16 inches (406 mm) on based on the assumption that interior walls and partitions,
center in both jambs and across the head. Panel anchors both load-bearing and nonload-bearing, floors and roof/
shall be embedded not less than 12 inches (305 mm) ceiling assemblies are constructed of light-framed construc-
and shall be provided with two fasteners so as to resist tion complying with the limitations of this code and the
the loads specified in Section R607.5.2. additional limitations of Section R608.2. Design and con-
struction of light-framed assemblies shall be in accordance
R607.5.2.2 Channel-type restraints. Glass unit
masonry panels shall be recessed not less than 1 inch (25 with the applicable provisions of this code. Where second-
mm) within channels and chases. Channel-type restraints story exterior walls are of light-framed construction, they
shall be oversized to accommodate expansion material in shall be designed and constructed as required by this code.
the opening, packing and sealant between the framing Aspects of concrete construction not specifically
restraints, and the glass unit masonry perimeter units. addressed by this code, including interior concrete walls,
R607.6 Sills. Before the bedding of glass units, the sill area shall comply with ACI 318.
shall be covered with a water-base asphaltic emulsion coat- R608.1.2 Other concrete walls. Exterior concrete walls
ing. The coating shall be not less than / inch (3 mm) thick. constructed in accordance with this code shall comply
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R607.7 Expansion joints. Glass unit masonry panels shall be with the shapes and minimum concrete cross-sectional
provided with expansion joints along the top and sides at all dimensions of Table R608.3. Other types of forming sys-
structural supports. Expansion joints shall be not less than / 8 tems resulting in concrete walls not in compliance with
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inch (10 mm) in thickness and shall have sufficient thickness this section shall be designed in accordance with ACI 318.
to accommodate displacements of the supporting structure. R608.2 Applicability limits. The provisions of this section
Expansion joints shall be entirely free of mortar and other shall apply to the construction of exterior concrete walls for
debris and shall be filled with resilient material. buildings not greater than 60 feet (18 288 mm) in plan dimen-
R607.8 Mortar. Glass unit masonry shall be laid with Type S sions, floors with clear spans not greater than 32 feet (9754
or N mortar. Mortar shall not be retempered after initial set. mm) and roofs with clear spans not greater than 40 feet (12
Mortar unused within 1 / hours after initial mixing shall be 192 mm). Buildings shall not exceed 35 feet (10 668 mm) in
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discarded. mean roof height or two stories in height above grade. Floor/
ceiling dead loads shall not exceed 10 pounds per square foot
R607.9 Reinforcement. Glass unit masonry panels shall (479 Pa), roof/ceiling dead loads shall not exceed 15 pounds
have horizontal joint reinforcement spaced not greater than per square foot (718 Pa) and attic live loads shall not exceed
16 inches (406 mm) on center located in the mortar bed joint. 20 pounds per square foot (958 Pa). Roof overhangs shall not
Horizontal joint reinforcement shall extend the entire length exceed 2 feet (610 mm) of horizontal projection beyond the
of the panel but shall not extend across expansion joints. Lon- exterior wall and the dead load of the overhangs shall not
gitudinal wires shall be lapped not less than 6 inches (152 exceed 8 pounds per square foot (383 Pa).
mm) at splices. Joint reinforcement shall be placed in the bed
joint immediately below and above openings in the panel. Walls constructed in accordance with the provisions of this
The reinforcement shall have not less than two parallel longi- section shall be limited to buildings subjected to a maximum
tudinal wires of size W1.7 or greater, and have welded cross design wind speed of 160 mph (72 m/s) Exposure B, 136 mph
wires of size W1.7 or greater. (61 m/s) Exposure C and 125 mph (56 m/s) Exposure D.
Walls constructed in accordance with the provisions of this
R607.10 Placement. Glass units shall be placed so head and section shall be limited to detached one- and two-family
bed joints are filled solidly. Mortar shall not be furrowed. dwellings and townhouses assigned to Seismic Design Cate-
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Head and bed joints of glass unit masonry shall be / inch (6.4
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mm) thick, except that vertical joint thickness of radial panels gory A or B, and detached one- and two-family dwellings
assigned to Seismic Design Category C.
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shall be not less than / inch (3 mm) or greater than / inch (16
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mm). The bed joint thickness tolerance shall be minus / inch Buildings that are not within the scope of this section shall
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(1.6 mm) and plus / inch (3 mm). The head joint thickness be designed in accordance with PCA 100 or ACI 318.
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tolerance shall be plus or minus / inch (3 mm). R608.3 Concrete wall systems. Concrete walls constructed
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in accordance with these provisions shall comply with the
shapes and minimum concrete cross-sectional dimensions of
SECTION R608 Table R608.3.
EXTERIOR CONCRETE WALL CONSTRUCTION R608.3.1 Flat wall systems. Flat concrete wall systems
R608.1 General. Exterior concrete walls shall be designed and shall comply with Table R608.3 and Figure R608.3(1) and
constructed in accordance with the provisions of this section or have a minimum nominal thickness of 4 inches (102 mm).
in accordance with the provisions of PCA 100 or ACI 318.
Where PCA 100, ACI 318 or the provisions of this section are R608.3.2 Waffle-grid wall systems. Waffle-grid wall
used to design concrete walls, project drawings, typical details systems shall comply with Table R608.3 and Figure
and specifications are not required to bear the seal of the archi- R608.3(2) and shall have a minimum nominal thickness of
tect or engineer responsible for design, unless otherwise 6 inches (152 mm) for the horizontal and vertical concrete
required by the state law of the jurisdiction having authority. members (cores). The core and web dimensions shall com-
ply with Table R608. 3. The maximum weight of waffle-
grid walls shall comply with Table R608.3.
276 2018 INTERNATIONAL RESIDENTIAL CODE ®
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